Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
N2O4(g)→ 2NO2(g)
In the endothermic reaction above, more products formed will be favored by
A constant values
an increase in pressure
a decrease pressure
a decrease volume
Correct answer is C
A decrease in pressure will result in the breaking or splitting of a larger molecule into a simpler ones. Options A, B, D are not in conformance to the reaction
what is the pH of 0.00lmoldm3 solution of sodium hydroxide
14
13
12
11
Correct answer is D
[H+][OH−] = 10 − 4
[H+] =10 − 14 ÷ [OH+]
=10 −14 ÷ (1 × 10 − 3) = 10 − 11
pH = − log10[H+ ]
= − log10[10 − 11] = − 1 × −11
log10[10 − 11] = 1
= − 1 × 11 × 1
= − 11
Which of the following compounds can be represented by the molecular formula C2 H6O?
propanal
ethanol
methanoic acid
glucose
Correct answer is B
Ethanol has the molecular formula C2H6O. Option A, C, D are not because their molecular are not different
If glucose is heated with concentrated tetraoxosulphate(vi)acid, it will be dehydrated to?
carbon
carbon(iv)oxide
ethane
ethanol
Correct answer is A
Carbon concentration of 4 will not give a precipitate heating. Option B,C,D will not be dehydrated
oxygen
chlorine
nitrogen
hydrogen
Correct answer is A
Oxygen is a substance that is used to remove impurities from pig iron. Options B, C, D will be effective in removing impurities positive]